Multiple-spindle driving mechanism



O. C. BORNHOLT.

MULTIPLE SPINDLE DRIVING MECHANISM.

APPLICATION man'nzc. 16. 1918.

2 SHEETS-SHEET I.

Patented Jan. 24, 1922.

31 nucvltoz/ (No Hugo V 0. C. BORNHOLT.

MULTIPLE SPINDLE DRIVING MECHANISM.

APPLICATION FILED n 1 I 8. 1,404,2 5, Patented Jan. 24,1922.

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mm i3 UNITED STATES PATENT OFFICE.

OSCAR o. BORNHOLT, or FLINT, MICHIGAN.

MULTIPLE-SPINDLE DRIVING MECHANISM.

To all whom it may concern v Be it known that I, OSCAR C. BORNHOLT,

a citizen of the United States of America, residing at Flint, in the county of Genesee and State of Michigan, have invented certain new and useful Improvements in Multiple-Spindle Driving Mechanism, of which the following is a specification, reference being had therein to the accompanying drawings.

My invention aims to provide power transmitting elements wherein some of the elements cooperate with a wall, partition or other structure in forming a lubricant chamber through which lubricant is forced by the action of the power transmitting elements.

My invention also aims to provide a multiple spindle drill head wherein the power transmitting elements are constructively arranged to insure a thorough lubrication of the bearings and other elements within the multiple spindle head, said head including a lubricant chamber and a bearing partition with said chamber and partition located relative to the power transmitting elements" so that said elements may cause a circulation of the lubricant and thus serve functionally as a pump or lubricant distributing agent.

My invention further aims to provide a multiple spindle drilling mechanism consisting of comparatively few parts that are compactly arranged and requir no attention whatsoever after proper installation.

This mechanism will be hereinafter described and then claimed, and reference will now be had to the drawings, wherein Figure 1 is a side elevation of a drill head in accordance with my invention;

Fig. 2 is a vertical sectional view on an enlarged scale Fig. 3 is a horizontal sectional view of the drill head taken on the line 1IIIII of Fig. 2; and

Fig. 4 is a horizontal sectional view taken on line IVIV of Fig. 2.

In the drawings, the reference numeral 1 denotes a drill head casing that has the inner wall thereof provided with a plurality of apertured bosses 2 and extending through these bosses are tie rods or screw bolts 3 adapted for holding the casing 1 between closure plates 1 and 5, th latter having an interposed wear or bearing plate 6. The closure plate 4 is carried by the lower end Specification of Letters Patent.

Patented Jan. 24, 1922.

Application filed December 16, 1918. Serial No. 267,040.

of an attaching sleeve 7 by which the drill head is connected to the usual form of spindle sleeve 8 forming part of a drill press or other machine, said spindle sleeve containing a mandrel adapted for imparting rotary movement to a drive shaft 9 journaled in the closure plates 1 and 5. The drive shaft 9, within the attaching sleeve 7, is interlocked for rotative continuity with the mandrel, and the lower end of said drive shaft has provision for receiving the tang of the drill spindle or similar tool. 7

The casing 1 has its inner wall provided with a vertical concave recess 10 and a similar recess 11 is provided by a vertical partition or block 12 set in the casing 1,

12. The partition 15 serves as a guide bean ing for the drive shaft 9 and cooperates with the wear plate 6 and the lower closure plate 5 in providing bearings for driven shafts 16 and 17 and idler shafts 18 and 19. The bearings within the horizontal partition 15 for the driven shafts 16 and 17 may be in the form of ball bearings, as indicated at 20, and these driven shafts have teeth 21 meshing with the teeth 22 of the idler shaft 19. The teeth 21 of the driven shaft 16 also mesh with teeth 23 of the idler shaft 18, which in turn mesheswith the teeth 24 of the drive shaft 9.

In this -manner power is transmitted from the drive shaft 9 through the idler shafts to the driven shafts, and provision has been made in connection with the lower ends of the driven shafts for holding drill chucks-or other tools, as clearly shown in Figs. 1 and 2. X

By reference to Fig. l, it will be noted that the idler shaft 19 and the driven shaft 17 have toothed peripheries that revolve in the recesses 10 and 11 and these two shafts cooperate in closing off a portion of the easing 1, from the remaining portion thereof, so

tion 15.

lubricant well or chamber 25.

of the chamber 25 has a drain port 26 in the plates 5 and 6, said drain port being nor mally closed by a plug 27. The top of the lubricant chamber 25 is closed by the par-- tition 15 and said partition has an opening 28 communicating with the chamber 25, so that lubricant may pass out of the top ofthe chamber on to the upper face of the parti This upper face of the partition has irregularly shaped lubricant .basins 29 and grooves 30, said grooves extending from the basins 29 to the bearings of the driven shafts 16 and 17 in the partition 15 for conducting lubricant to said bearings. Since the upper ends of the idler shafts 18 and 19 are also ou'rnaled in the partition 15, it is obvious that these ends of the shafts will also be lubricated.

The partition 15, adjacent the drive shaft 9 and at a point remote from the lubricant chamber 25, has a depending ported portion or conduit 31; It is through this port or conduit that lubricant flows from the upper.

face of the partition 15 into the bottom portion of the casing 1, and assuming that a suitable lubricant has been placed inthe chamber or well 25, through a normally 'closed lilling opening'32 in the upper plate p r 1. The combination of a casing, a verti- 4:, the circulation of thelubricant is as follows.

lVhen the drill head is placed in operation,

the lubricant within the lower portion of the casingv 1 is carried into the chamber 25 by theteeth of the shafts 17 and 19, said shafts serving somewhat as rotary pistons or abutments in conducting or forcing lubricant from the greater part'of the casing 1 tothe The lubricant will be carried between the teeth of the shafts 17 and 19 and the walls of the recesses 10 and 11, said shafts continually supplying the chamber 25 i with a lubricant. As the chamber 25 fills and overflows through the opening 28 on tothe partition 15, all of the hearings in the partition are thoroughly oiled before the lubricant eventually fiows downwardly through the'port or conduit 31 into the lower portion of the casing 1, from there it is again carried into the chamber 25 and this circulation continues as long as the drillhead is in operation.

The toothed drive, driven and idler shafts within thecasing 1 serve functionally as a train of gear wheels, and the direction of rotation necessary onthe part of said gear wheels to conduct the lubricant into the chamber 25 'may necessitate operating the spindle carrying shafts in one direction, but

wheels between the bottom of the casing and the partition therein so as to alforda lubricant chamber or reservoir into which a lubricant may be forced by the rotary action of certain gear wheels within the drill head.

- Again, it is apparent that the'arrangement of gear wheels, particularly the idlers, is such as to prevent crowding or amming of the gear wheels, since the direction of rotation is such as to produce outward movement by the idlers should a driven shaft be momentarily retarded. This, .together with the-thorough lubrication, constitutes animportant part of my invention.

It is thought that the operation and utility of the lubricant circulating means will be apparent without further description, and while in the drawings there is illustrated a prefe'rred'embodiment of my invention, it is to be understood that the structural elements are susceptible to such variations and modificati'ons as fall withinthe scope of the appended claims. V

What I claim is:- 4

cally disposedlubricant chamber in said casing having its lower end opening into said 'journaled in said partition adapted to mainta1n lubricant in sald chamber and cause the lubricant to flow upwardly into said chamber in a direction parallel to the axes of'said power transmission elements. 2. A multi-spindle drill head comprising a casing having recesses therein, power transmitting elements in the recesses ofsaid head and cooperating with the wall thereof in providing a lubricant chamber, and a partition. in the upper part of said head affording bearings for said power transmitting elements and adapted to receive lubricant from said chamber and distribute the lubricant to the bearings of said power transmitting elements. I 1 1 In testimony whereof I afiix my signature in the presence of two witnesses.

. OSCAR o. BORNHOLT.

lVitnesses: A 1

'0. F. BARTHEL, T.'O. STIRLING. 

